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Loans - Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 17,889,651 $ 17,481,309
Total loans percentage 100.00% 100.00%
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 4,770,228 $ 4,955,341
Total commercial and industrial percentage of total loans 26.70% 28.40%
Energy Production [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 886,627 $ 976,473
Percentage of energy production loans to total loans 5.00% 5.60%
Energy Service [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 90,510 $ 116,825
Percentage of energy service loans to total loans 0.50% 0.70%
Energy Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 125,072 $ 141,900
Percentage of other energy loans to total loans 0.70% 0.80%
Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 1,102,209 $ 1,235,198
Percentage of total energy loans to total loans 6.20% 7.10%
Paycheck Protection Program [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 3,129,244 $ 2,433,849
Percentage Of Payment Protection Program Loans To Loans 17.50% 13.90%
Commercial mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 5,566,367 $ 5,478,806
Commercial mortgages percentage of total loans 31.10% 31.30%
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 1,236,994 $ 1,223,814
Construction percentage of total loans 6.90% 7.00%
Commercial land loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 300,669 $ 317,847
Land percentage of total loans 1.70% 1.80%
Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 7,104,030 $ 7,020,467
Total commercial real estate percentage of total loans 39.70% 40.10%
Home Equity Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 318,215 $ 329,390
Home equity loans percentage of total loans 1.80% 1.90%
Home Equity Line of Credit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 454,722 $ 452,854
Home equity lines of credit percentage of total loans 2.50% 2.60%
Other consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 549,217 $ 548,530
Other percentage of total loans 3.00% 3.10%
Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 1,322,154 $ 1,330,774
Total consumer real estate percentage of total loans 7.30% 7.60%
Real Estate Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 8,426,184 $ 8,351,241
Total real estate percentage of total loans 47.00% 47.70%
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned discounts $ 461,786 $ 505,680
Total consumer and other percentage of total loans 2.60% 2.90%